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The private implementation classes of the Apache MyFaces Core JSF-2.3-next Implementation
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.myfaces.cdi.util;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Set;
import javax.enterprise.context.ContextNotActiveException;
import javax.enterprise.context.SessionScoped;
import javax.enterprise.context.spi.Context;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.faces.context.ExternalContext;
import javax.faces.view.ViewScoped;
import org.apache.myfaces.webapp.AbstractFacesInitializer;
/**
* Lookup code for Contextual Instances.
*/
public class CDIUtils
{
public static BeanManager getBeanManager(ExternalContext externalContext)
{
return (BeanManager) externalContext.getApplicationMap().get(
AbstractFacesInitializer.CDI_BEAN_MANAGER_INSTANCE);
}
public static T get(BeanManager bm, Class clazz)
{
Set> beans = bm.getBeans(clazz);
return resolveInstance(bm, beans, clazz);
}
public static T getOptional(BeanManager bm, Class clazz)
{
Set> beans = bm.getBeans(clazz);
if (beans == null || beans.isEmpty())
{
return null;
}
return resolveInstance(bm, beans, clazz);
}
private static T resolveInstance(BeanManager bm, Set> beans, Type type)
{
Bean bean = bm.resolve(beans);
CreationalContext cc = bm.createCreationalContext(bean);
T instance = (T) bm.getReference(bean, type, cc);
return instance;
}
@SuppressWarnings("unchecked")
public static Bean get(BeanManager beanManager, Class beanClass, Annotation... qualifiers)
{
Set> beans = beanManager.getBeans(beanClass, qualifiers);
for (Bean bean : beans)
{
if (bean.getBeanClass() == beanClass)
{
return (Bean) beanManager.resolve(Collections.>singleton(bean));
}
}
return (Bean) beanManager.resolve(beans);
}
public static T get(BeanManager beanManager, Class beanClass,
boolean create, Annotation... qualifiers)
{
try
{
Bean bean = get(beanManager, beanClass, qualifiers);
return (bean != null) ? get(beanManager, bean, beanClass, create) : null;
}
catch (ContextNotActiveException e)
{
return null;
}
}
public static T get(BeanManager beanManager, Type type, boolean create, Annotation... qualifiers)
{
try
{
Set> beans = beanManager.getBeans(type, qualifiers);
Bean bean = (Bean) beanManager.resolve(beans);
return (bean != null) ? get(beanManager, bean, type, create) : null;
}
catch (ContextNotActiveException e)
{
return null;
}
}
public static T get(BeanManager beanManager, Bean bean, Type type, boolean create)
{
if (create)
{
CreationalContext creationalContext = beanManager.createCreationalContext(bean);
return (T) beanManager.getReference(bean, type, creationalContext);
}
else
{
Context context = beanManager.getContext(bean.getScope());
return context.get(bean);
}
}
public static boolean isSessionScopeActive(BeanManager beanManager)
{
try
{
Context ctx = beanManager.getContext(SessionScoped.class);
return ctx != null;
}
catch (ContextNotActiveException ex)
{
//No op
}
catch (Exception ex)
{
// Sometimes on startup time, since there is no active request context, trying to grab session scope
// throws NullPointerException.
//No op
}
return false;
}
public static boolean isViewScopeActive(BeanManager beanManager)
{
try
{
Context ctx = beanManager.getContext(ViewScoped.class);
return ctx != null;
}
catch (ContextNotActiveException ex)
{
//No op
}
catch (Exception ex)
{
// Sometimes on startup time, since there is no active request context, trying to grab session scope
// throws NullPointerException.
//No op
}
return false;
}
}